This file is indexed.

/etc/default/add-apt-key is in add-apt-key 1.0-0.5.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# This is a configuration file for /usr/sbin/add-apt-key

# Select the default keyserver to retrieve GPG keys
# KEYSERVER=pgp.mit.edu
KEYSERVER=subkeys.pgp.net